Abstract
A gene, designated msp, that encodes a major secreted polypeptide with a molecular mass of approximately 60 kilodaltons (kDa) was cloned from Listeria monocytogenes 10403. DNA hybridization analysis indicated that the msp gene was highly conserved among 15 independent L. monocytogenes isolates and that each of 5 isolates tested secreted a 60-kDa polypeptide that was immunologically related to the msp gene product. DNA sequences related to msp were not detected in any other Listeria species or in strains of Bacillus cereus, Bacillus thuringiensis, Streptococcus pyogenes, or Streptococcus pneumoniae when standard stringent DNA hybridization conditions were used. Under nonstringent conditions, related sequences were detected in Listeria ivanovii, Listeria seeligeri, and Listeria innocua, and immunoblot analysis indicated that these strains secreted polypeptides of about 60 kDa that were immunologically related to the msp gene product. The possibility of using the msp gene as a probe for the detection of L. monocytogenes and the potential functions of the msp gene product are discussed.
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